What Ketron keyboard would be the top line ? Similar to Yamaha's Genos which is their Top of the line.

Hi Ron.

I would think it's the SD9 that is the TOTL arranger within the Ketron brand... at least with 76 keys.

https://www.ketron.it/en/products/1-electronic-keyboards

What interests me is the "Midi to Style" in the PA4X (Not yet in the PA5X)...... Does Ketron have something similar ? What is it like to create custom styles on a Ketron ?

As far as I know the 'automatic' midi to style feature is not present at Ketron keyboards.
I've not used Ketron since SD1, and that time I used EMC to convert.

Yeah, I could see that PA5X missed it, maybe they add in a later update, or even better, as a PC software.
I'm going to add a Korg again, but if it's the PA5X, or a mint condition PA4X-76 only time will tell.
If PA5, I think it maight be a good thing to wait a while, but to be long time patient is not that easy...